ChangeLog: Fill release date for 1.0.0

Author: hartwork

ChangeLog

@@ -2,7 +2,7 @@ NOTE: uriparser is looking for help with a few things:
       https://github.com/uriparser/uriparser/labels/help%20wanted
       If you can help, please get in touch.  Thanks!
 
-????-??-?? -- 1.0.0
+2025-12-15 -- 1.0.0
 
 >>>>>>>>>>>>> SECURITY >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
   * Fixed: [CVE-2025-67899]